public class PC{
  CPU cpu;
  HardDisk HD;
  void setCPU(CPU cpu){
   this.cpu=cpu;
  }
void setHardDisk(HardDisk HD){
   this.HD=HD;
 }
void show(){
   System.out.println("CPU速度:"+cpu.getSpeed());
   System.out.println("硬盘容量:"+HD.getAmount());
}
}
